Scope

As explained in Build Python Web Apps with Streamlit

Scope is the boundary of functionality and behavior included in a software project or application.

Scope sets the boundary of what an application will and will not do. Writing both sides prevents users and collaborators from assuming features that are not planned. section 3.3.1

Define scope by making deliberate choices about requirements, complexity, and future versions:

• List the features users need, then remove work that does not directly support the application’s goal. section 3.3.1 section 4.1.2
• Defer functionality that introduces a new dependency or difficult problem. A simple unit converter can use fixed factors, while currency conversion requires changing exchange rates and an external API. section 3.3.1
• Record exclusions as well as inclusions. This supports prioritization, phasing, and conversations with stakeholders about a later version. section 3.3.1

A daily to-do list

A deliberately narrow to-do app lets users view, add, remove, complete, and undo tasks, and see completion totals. It does not retrieve tasks after refresh, export them, or save their history. The app therefore remains within one browser session and starts with a blank slate each day. section 4.1.2

Figure 3.1 The six-step app development workflow

Use the six-step workflow to place scope inside development: state the concept, define requirements, visualize the user experience, brainstorm implementation, write code, and iterate. Scale each step to the project. section 3.1

How Build Python Web Apps with Streamlit covers it

How deep it goes

Explains scope through requirements, exclusions, complexity trade-offs, and examples, but stops short of implementation internals.

Examples

Uses a unit converter and a single-session to-do list to demonstrate inclusions, exclusions, dependencies, and deliberate limitations.

What it assumes

Assumes a proposed application or user need, while teaching from zero how to turn that idea into concrete boundaries.

What you can do after

Apply scope by writing requirements and exclusions, prioritizing features, and phasing deferred functionality.

How it connects

Connects scope to requirements, user experience, implementation, prioritization, phasing, and persistence.

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Also explained in

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  ASP.NET Core in Action, 3eA scope is a named permission describing an operation or resource that a client or user has been granted or consented to access.
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  Authorization in ActionA scope is the policy element that identifies the principals, actions, and resources to which a policy applies.
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  Azure SecurityA scope is the level and set of Azure resources to which a role assignment or governance configuration applies.
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  Think Like a Software Engineering ManagerProject scope is the defined set of goals, requirements, deliverables, boundaries, assumptions, and exclusions for a project.
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  Lead Developer Career GuideThe defined boundaries, objectives, deliverables, and work included in a project.
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  Spring in Action, Sixth EditionAn OAuth2 scope is a named permission specifying the protected resources or claims a client may request from a provider.
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  Microsoft Azure in ActionAn authorization scope is the boundary of resources or areas to which an access or authorization assignment applies.
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  Spring Security in Action, Second EditionAn OAuth scope is a named permission value that limits the access or identity information requested by a client.

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Related concepts

• prompt structurepart of · Prompt structure is the organization of a prompt’s content and instructions to guide a model’s response or generation.
• role assignmentpart of · A role assignment is an access-control configuration that grants a principal an authorization role or specified permissions for a defined scope.
• OAuthused by · OAuth is an authorization framework that enables a client to obtain limited, delegated access to protected resources without receiving the resource owner's credentials.
• principle of least privilegeimplements · The principle of least privilege is a security principle that grants each user, process, or other subject only the access rights necessary for its authorized tasks.
• policypart of · A policy is a rule, strategy, or mapping that governs or determines decisions, actions, permissions, or behavior under specified conditions.

This explainer was generated by Manning's knowledge graph from the text of Build Python Web Apps with Streamlit. The section links point to the parts of the book it draws on.